C#实现确保单进程类

通过监听本地设定的TCP端口实现，无网卡也没问题。解决防火墙问题，不会弹出防火墙询问。

 1/**//*------------------------------------------
 2* 模块名称：确保单进程类
 3* 设计作者：张鹏
 4* 设计日期：2009-6-4
 5* 备注：大风扇吹空香皂盒
 6*------------------------------------------*/
 7using System;
 8using System.Collections.Generic;
 9using System.Text;
10using System.Net.Sockets;
11using System.IO;
12using System.Threading;
13using System.Net;
14
15namespace aaaSoft
16{
17    /**//// <summary>
18    /// 单进程类
19    /// </summary>
20    class SingleProcess
21    {
22        private string GuidString;
23        private int TcpPort;
24        private TcpListener listener;
25
26        /**//// <summary>
27        /// 构造函数
28        /// </summary>
29        /// <param name="GuidString">唯一标识符</param>
30        /// <param name="TcpPort">监听TCP端口号</param>
31        public SingleProcess(string GuidString, int TcpPort)
32        {
33            this.GuidString = GuidString;
34            this.TcpPort = TcpPort;
35        }
36
37        /**//// <summary>
38        /// 当第二进程运行时引发
39        /// </summary>
40        public event EventHandler SecondProcessStart;
41
42        /**//// <summary>
43        /// 开始确保单进程
44        /// </summary>
45        public void Start()
46        {
47            try
48            {
49                listener = new TcpListener(IPAddress.Parse("127.0.0.1"), TcpPort);
50                listener.Start();
51                Thread trdListen = new Thread(Run);
52                trdListen.Start();
53            }
54            catch
55            {
56                //说明已经有实例存在
57                TcpClient client = new TcpClient();
58                client.Connect("127.0.0.1", TcpPort);
59                NetworkStream ns = client.GetStream();
60                byte[] buffer = Encoding.Default.GetBytes(GuidString);
61                ns.Write(buffer, 0, buffer.Length);
62                ns.Close();
63                Environment.Exit(0);
64            }
65        }
66        /**//// <summary>
67        /// 结束确保单进程
68        /// </summary>
69        public void Stop()
70        {
71            listener.Stop();
72        }
73
74        private void Run()
75        {
76            try
77            {
78                while (true)
79                {
80                    TcpClient client = listener.AcceptTcpClient();
81                    NetworkStream ns = client.GetStream();
82                    StreamReader sr = new StreamReader(ns);
83                    string s = sr.ReadToEnd();
84                    ns.Close();
85                    if (s.Equals(GuidString))
86                    {
87                        //触发事件
88                        SecondProcessStart.Invoke(null, null);
89                    }
90                }
91            }
92            catch { }
93        }
94    }
95}

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下面是使用示例，仅需要修改Program.cs文件(Demo项目Program.cs文件如下)：

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 1using System;
 2using System.Collections.Generic;
 3using System.Windows.Forms;
 4
 5namespace 单实例运行
 6{
 7    static class Program
 8    {
 9        const int TcpPort = 53256;
10        const string GuidString = "C0DA3908-7F39-45ad-8E5B-CC47064031EA";
11        public static aaaSoft.SingleProcess sp;
12
13        public static Form frmMain;
14        /**//// <summary>
15        /// 应用程序的主入口点。
16        /// </summary>
17        [STAThread]
18        static void Main()
19        {
20            Application.EnableVisualStyles();
21            Application.SetCompatibleTextRenderingDefault(false);
22            frmMain = new Form1();
23
24            sp = new aaaSoft.SingleProcess(GuidString, TcpPort);
25            sp.SecondProcessStart += new EventHandler(sp_SecondProcessStart);
26            sp.Start();
27            Application.Run(frmMain);
28            sp.Stop();
29        }
30
31        static void sp_SecondProcessStart(object sender, EventArgs e)
32        {
33            frmMain.WindowState = FormWindowState.Normal;
34            frmMain.Show();
35            frmMain.Activate();
36        }
37    }
38}